Today we tagged WC 2.2 beta 3 which should be the last beta before release.
Beta 3 contains mostly bug fixes and an update to the Language Pack Downloader to make it compatible with WP 4.0. You can view a comparison between beta 2 and master here.
Again, we’re happy to hear your feedback about 2.2 and would appreciate any bug reports going directly to Github.
If you find a bug with the beta, please ensure you prepend the ticket title with [2.2] when submitting the issue to GitHub, or at least mention what version you are using in the ticket description.